Commitments and Contingent Liabilities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Operating lease expiration description	The facilities of the Company are leased under various operating lease agreements for periods ending no later than 2024.
Pledged bank deposits	$ 1,035	$ 807
Operating lease and other contractual commitments	$ 1,190	$ 955
Motor Vehicles
Loss Contingencies [Line Items]
Operating lease expiration description	The Company also leases motor vehicles under various operating leases, which expire on various dates, the latest of which is in 2020.
Maximum
Loss Contingencies [Line Items]
Operating lease agreements, expiration year	2024
Maximum | Motor Vehicles
Loss Contingencies [Line Items]
Operating lease agreements, expiration year	2020